# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0182561        0.00198689    
     0.460000          0.700000         0.0185921        0.00186066    
     0.700000           1.00000         0.0178876        0.00219888    
      1.00000           1.54000         0.0181920        0.00196959    
      1.54000           2.40000         0.0164331        0.00254397    
      2.40000           4.80000         0.0207412        0.00294854    
      4.80000           10.0000         0.0178694        0.00426036